February 2010 - Neos-comments - mailman3.cels.anl.gov

[NEOS Support Req #341] Re: Job#: 2046014
by Jason Sarich 25 Feb '10

25 Feb '10

Kyle, The workstations running the Cbc solver should be back up now, let us know if you have any more trouble. Jason Sarich Argonne National Laboratory On Wed, Feb 24, 2010 at 1:19 PM, Gorski, Kyle J <Kyle.J.Gorski(a)uwsp.edu>wrote: > To whom this may concern, > > I am wondering why the server has been unavailable as of late? I have been > attempting to submit my files to cbc in ampl, but I get this: > > "Job 2046014 has finished. > No stations available for solver milp:Cbc:ampl. > Solver administrator has been notified." > > > > Thank you for your time! > > Kyle Gorski > UW-Stevens Point > >

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[NEOS Support Req #340] Re: Regarding NEOS Server
by Jason Sarich 25 Feb '10

25 Feb '10

This should be working agin, let us know if you have more problems. Jason Sarich Argonne National Laboratory On Thu, Feb 25, 2010 at 8:23 AM, KD SINGH <kds97dee(a)gmail.com> wrote: > Dear NEOS Officials, > > Thanks for providing open source tool for solving nonlinear > programming problems. > > I am getting problem that after uploading my model when I submit it to > NEOS Server it gives error > > "<class 'xmlrpclib.Fault'> " > A problem occurred in a Python script. Here is the sequence of > function calls leading up to the error, in the order they > occurred......... > > Is the server is down or any other problem is there. > > Please guide what I can do to resolve. > > Regards > > Kanwardeep Singh > R/S, Deptt. of Electrical Engineering, > Indian Institute of Technology, Roorkee, India >

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[NEOS Support Req #338] Regarding NEOS Server
by KD SINGH 25 Feb '10

25 Feb '10

Dear NEOS Officials, Thanks for providing open source tool for solving nonlinear programming problems. I am getting problem that after uploading my model when I submit it to NEOS Server it gives error "<class 'xmlrpclib.Fault'> " A problem occurred in a Python script. Here is the sequence of function calls leading up to the error, in the order they occurred......... Is the server is down or any other problem is there. Please guide what I can do to resolve. Regards Kanwardeep Singh R/S, Deptt. of Electrical Engineering, Indian Institute of Technology, Roorkee, India

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[NEOS Support Req #339] Job#: 2046014
by Gorski, Kyle J 24 Feb '10

24 Feb '10

To whom this may concern, I am wondering why the server has been unavailable as of late? I have been attempting to submit my files to cbc in ampl, but I get this: "Job 2046014 has finished. No stations available for solver milp:Cbc:ampl. Solver administrator has been notified." Thank you for your time! Kyle Gorski UW-Stevens Point

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[NEOS Support Req #337] Error when using SCIP
by M. Saminathan 09 Feb '10

09 Feb '10

Hi, I get the following error when I submit jobs to use SCIP to solve my milp problem. _________________________________________________________________________________________________________ Failed to initialize CPLEX environment. CPLEX Error 32201: ILM Error 8: CPLEX: access key has expired (see http://support.ilog.com/faqmsg?m=ILM-8&v=2.62f) Exiting __________________________________________________________________________________________________________________ M. Saminathan 215-860-1916

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[NEOS Support Req #336] NEOS Information
by Patricio Pastenes 06 Feb '10

06 Feb '10

Hi, i'm a student from Chile(southamerica), first of all, i'm very grateful with you, because you let me know my results of large mip problems. I'm very interested in buy iLOG CPLEX like you, but i don't know what kind of computer do i need for solve my problems?. Generally, they are around of 4000 up to10000 vars and 6000 up to 15000 constraints. So, could you help me? What kind of computer do i need to handle this kind of mip problems (Processor speed, ram memory,etc)? Also, i'm interested in know what computer do you have? thanks for your time and your advice. Regards. -- Atte. Patricio Pastenes A.

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[NEOS Support Req #335] generating multiple solutions with BARON
by Endelman, Jeffrey 03 Feb '10

03 Feb '10

I am interesting in generating all optimal solutions to a MINLP problem. I have been able to find one optimal solution using BARON (see Job #2032677). According to the BARON manual, there is a function called "numsol" which can be used to generate a specified number of suboptimal (or degenerate optimal) solutions, but this seems to involve the use of gdx. My understanding is that this kind of file I/O is not permitted with the web interface of the NEOS server. If true, is there a way to get around this? I am not clear what the Kestrel client is for. Would that address this issue? Thank you, Jeffrey Endelman

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[NEOS Support Req #334] Re: Fwd: NEOS Results for Job #2031126
by Jason Sarich 03 Feb '10

03 Feb '10

Tanzil, The workstation did not have enough memory to process your job and terminated. I'm not sure why the error message didn't get displayed in the results. There is no best integer program solver on NEOS, it depends upon the problem and the formulation. My advice is to try as many as you can and see which one works best for you. Jason Sarich Argonne National Laboratory On Tue, Feb 2, 2010 at 7:51 AM, vicky hartanto tanzil < vicky.tanzil(a)googlemail.com> wrote: > hello neos admin, > > i would like to ask you about scip. > i have sent an integer program problem to the neos server (described in the > email below), > it said that there is a job result, > but how can i see the solution? > > or can you suggest other good solver for an integer program in neos? > > thank you, > tanzil > > > ---------- Forwarded message ---------- > From: NEOS Administrator <neos(a)mcs.anl.gov> > Date: Mon, Feb 1, 2010 at 8:44 PM > Subject: NEOS Results for Job #2031126 > To: vicky.tanzil(a)googlemail.com > > > Job results too long for email. Download results from > http://neos.mcs.anl.gov/neos/admin.html > Job Number=2031126, Password=AyUwLDmP > >

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[NEOS Support Req #333] Fwd: NEOS Results for Job #2031126
by vicky hartanto tanzil 02 Feb '10

02 Feb '10

hello neos admin, i would like to ask you about scip. i have sent an integer program problem to the neos server (described in the email below), it said that there is a job result, but how can i see the solution? or can you suggest other good solver for an integer program in neos? thank you, tanzil ---------- Forwarded message ---------- From: NEOS Administrator <neos(a)mcs.anl.gov> Date: Mon, Feb 1, 2010 at 8:44 PM Subject: NEOS Results for Job #2031126 To: vicky.tanzil(a)googlemail.com Job results too long for email. Download results from http://neos.mcs.anl.gov/neos/admin.html Job Number=2031126, Password=AyUwLDmP

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[NEOS Support Req #332] Re: Using ipopt on blatz.ie.lehigh.edu but ran out of memory
by Jason Sarich 01 Feb '10

01 Feb '10

blatz (and the other Lehigh machines where Ipopt runs) has a limit of ~400MB. Jason Sarich Argonne National Laboratory On Mon, Feb 1, 2010 at 2:26 PM, Eriksson, Emmanuel < Emmanuel.Eriksson(a)osfi-bsif.gc.ca> wrote: > We discovered a couple of weeks ago and it has been a great tool for > quickly developing a proof-of-concept for a planned in-house application > that uses non-linear optimization to compute the solution space for complex > financial data constrained by various rules. > > Thanks for the great service. > > Note that I recently ran into a resource issue with job # 2031352 (ipopt > running on blatz.ie.lehigh.edu) The problem had 95626 variables and 55480 > constraints. The solver failed with message "Not enough memory". > > Question -> I'm curious to know what memory resources exist for that > server. I'd like to duplicate the experiment in house and want to make sure > I don't run into the same issue. > > Emmanuel Eriksson > Consultant, > Office of the Superintendent of Financial Institutions Canada > www.osfi-bsif.gc.ca > (613) 990-8600 (direct) >

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